Lock for hoisting hooks



Aug. 12, 1924. 7 1,505,051 F. LINDGREN LOCK FOR HOISTING HOOKS Filed Aug. 22 1921 Patented Aug. 12, 1924.

UNITED STATES PATENT OFFICE.

FRED LINDGREN, OF BENTON, WASHING-TON; OLOF LINDGREN EXECU'IOR OF SAID FRED LINIJGREN, DECEASED.

LOCK non norsrnve HooKs.

Application filed August 22, 1921. Serial no. 494,129.

T all whom it may concern:

Be it known that I, FRED LINDGREN, a citizen of the United States, residing at Benton, in the county of King and State of lVashington, have invented a vcertain new and useful Improvement in Looks for Hoisting Hooks, of which the following is a specification.

My invention relates to improvements in hooks and the object of my invention is to provide quickly and easily releasable looking means for closing the opening between the point and the shank of a hook to thereby prevent objects that have been engaged therefrom by accident. I v

Anotherobject is to provide a; hook closing latch that is not in the way when in an open position and that will automatically look when it is moved into a closed position.

A further object is to provide a hook closing latch that is strong and simple in construction, eflicient in operation, easy to operate and not liable toqget out of order.

A still further object is to provide a hook closing device having a recess in its outer end that is arranged to fit over the point of the hook to thereby strengthen said hook closing device and to prevent it from bending when subjected to force that tends to join it sidewise and to provide a hook closing device having frictional means for yieldingly holding it in an open position.

This hook closing latch is particularly well adapted for use on large heavy hooks of the form commonly used in logging heavy timber, but it will be understood that the same may be applied to other hooks if desired.

With the above and other objects in view as will be apparent from the following description the invention consists in the novel construction, adaptation and combination of parts of a releasable hook closing latch as i will be more clearly hereinafter described and claimed. 7

In the accompanying drawings, Figure 1 is a view in side elevation of a hook that is equipped with a hook closing latch constructed in accordance with my invention, the latch being shown in an open position.

Fig. 2 is a view partly in elevation and partly in cross-section of the same, showing the latch in a closed position;

Fig. 3 is a detached yiew in elevation with such hook from being disengaged shown a hook 5 having the usual point 6 and having a shank portion 7 that is flattened on opposite sides and is provided with a transverse hole for the reception of a pivot pin 8.

My invention consists in the provision of a latch member 10 having one end cut away or recessed, as at 11, to form side flanges 12 that fit over the opposite sides otthe flattened shank portion 7 of the hook and that are pivoted on the pin 8. The flanges 12 are connected with each other at their rear side by an integral web or side wall 13 that extends partly around the end of the latch member and that serves as a stop that engages with the rear edge of the shank portion 7 of the hook to limit the movement of the latch member when the same is moved into an open position as shown in Fig. 1.

The latch member 10 is provided with a lon itudinally extending cylindrical recess 14 that is connected by a relatively narrow slot 15 with a wider groove 16 on the inner edge of the latch member, said recess 14, slot 15 and groove 16 being adapted for the reception of a locking plunger comprising a cylindrical body portion 17 arranged to slide in the recess 14c, a thumb piece 18 movable in the groove 16, a narrow integral neck portion 20 connecting the body portion 17 and thumb piece 18 and extending through the narrow slot 15 and a forwardly protruding integral stud or bolt 21 arranged to enter a recess 22 in the shank portion 7 of the hook.

The outer end of the latch member 10 is recessed or slotted as at 23, for the reoeption of the end 6 of the hook 5 and a wall 2 1 is left betweenthe re'cess23 and the recess 14:, wherein the looking plunger is disposed, said wall having a plug 25 screwed therein and arranged to be removed to permit the removal of a compression spring 26 that normally urges the locking plunger toward the shank 7 of the hook.

A clevis 27 that fits over the flanges 11 of the latch member is provided, and is mounted on the pivot pin 8 and is connected at its outer end by a swivel connection with a ring 28 or similar device to which any suitable cable ,or chain, not shown, may be secured.

When the latch member 10 is turned into the open position as shown in Fig. 1, it leaves the opening to the hook free and unobstructed so that the hook may be engaged with any desired object in the usual manner. After the hook has been made fast to the object to which it is to be connected the latch member 10 may be moved into the position shown in Fig. 2, to close the opening to the hook, the bolt 21 dropping into the recess 22 and locking the latch member in the closed position.

Vhen the latch member 10 is closed it may be released by placing the thumb or finger on the thumb piece 18 and moving the locking plunger outwardly against the pressure of the spring 26 far enough. to withdraw the bolt 21 from the recess 22 whereupon the latch member may be swung intothe open position.

WVhen the bolt 21 is not in the recess 22 it frictionally engages the peripheral surface of the shank portion 7 of the hook thereby serving as a yielding detent means to hold the latch member in either a. full open or a partially open position.

The recess 23 in the end of the latch member fits over the end 6 of the hook and thereby serves to brace the latch member and make it rigid against any force that might tend to bend it sidewise.

The thumb piece 18 is disposed entirely within the groove 16 so that it will be pro tected from contact with objects that might tend to unlock the device accidentally.

The recess 22 in the hook 5 is in such a location that it does not weaken the hook and the bolt 21 that enters said recess forms a positive lock that will prevent movement of the latch member 10 until said bolt is voluntarily withdrawn.

The spring 26 may be of any desired strength and may be replaced by removing the plug thereby obviating the necessity of removing the pivot pin 8 and disassembling the hook in case the spring breaks or is weakened by use.

This latch member is strong and simple in construction, easy to manipulate, not expensive to manufacture, not liable to be broken or twisted out of shape by hard and severe use, not in the way when in an unlocked position and is adapted to completely close the opening to the hook on which it is installed so that it will be impossible for the hook to become accidentally disengaged from any object with which it has been engaged.

The foregoing description taken in connection with the accompanying drawings clearly disclose the principles of construc tion and method of operation of my hook closing and locking device, but, while I have shown and described what I now consider to be the preferred form of my invention it will be understood that the drawings are merely illustrative and that such changes in the form dimensions and arrangement of the various parts of the device may be made as are within the scope of the following claim.

What I claim is:

The combination with a clevis having a hook pivotally connected thereto, said hook having a shank provided on its inner edge with a bolt receiving recess and having a point that terminates near said recess, said recess being in alinement with the said hook pivot and point, of a latch member )ivoted on said shank, and having a slotter outer end that is adapted to fit over the hook point when the said latch member is moved to close the gap between the shank and the point of said hook, said latch member having a longitudinally extending cylindrical recess formed therein and having a groove in one edge thereof that is connected with said recess by a slot of less width than said groove, said cylindrical recess being in alinement with said hook pivot, shank carried recess, and hook point when the latch is in its closed position, a plunger reciprocable in said recess in said latch member, a stud on said )lunger arranged to enter the shank carrie recess, a spring for urging said plunger toward the shank of said hook, a plug seated in said latch slot for retaining said spring in the cylindrical recess, said plug being positioned below said hook point when the latch is in its closed position, and a thumb piece fitted in said plunger and disposed within the groove of said locking member adjacent the inner side of the latch member.

In witness whereof, I hereunto subscribe my name this 30th da of July, A. D. 1921.

F ED LINDGREN. 

